diff --git a/packages/aws-cdk/lib/cdk-toolkit.ts b/packages/aws-cdk/lib/cdk-toolkit.ts
index 70d7650f58f7b..e5ff7cc642af3 100644
--- a/packages/aws-cdk/lib/cdk-toolkit.ts
+++ b/packages/aws-cdk/lib/cdk-toolkit.ts
@@ -143,6 +143,8 @@ export class CdkToolkit {
       }
     }
 
+    stream.write(format('\n✨  Number of stacks with differences: %s\n', diffs));
+
     return diffs && options.fail ? 1 : 0;
   }
 
diff --git a/packages/aws-cdk/test/diff.test.ts b/packages/aws-cdk/test/diff.test.ts
index 128c933dad245..ad8202a64db63 100644
--- a/packages/aws-cdk/test/diff.test.ts
+++ b/packages/aws-cdk/test/diff.test.ts
@@ -81,6 +81,7 @@ describe('non-nested stacks', () => {
     expect(plainTextOutput).toContain('Stack A');
     expect(plainTextOutput).toContain('Stack B');
 
+    expect(buffer.data.trim()).toContain('✨  Number of stacks with differences: 2');
     expect(exitCode).toBe(0);
   });
 
@@ -96,6 +97,7 @@ describe('non-nested stacks', () => {
     });
 
     // THEN
+    expect(buffer.data.trim()).toContain('✨  Number of stacks with differences: 1');
     expect(exitCode).toBe(1);
   });
 
@@ -121,6 +123,7 @@ describe('non-nested stacks', () => {
     });
 
     // THEN
+    expect(buffer.data.trim()).toContain('✨  Number of stacks with differences: 1');
     expect(exitCode).toBe(1);
   });
 
@@ -255,7 +258,10 @@ Resources
          └─ [~] .Properties:
              └─ [~] .Prop:
                  ├─ [-] old-value
-                 └─ [+] new-value`);
+                 └─ [+] new-value
+
+
+✨  Number of stacks with differences: 3`);
 
     expect(exitCode).toBe(0);
   });